# -*- coding: utf-8 -*-
# Copyright 2026 Nexa Systems Inc.
# License OPL-1
"""Migrate the single Default CoC Contact (Many2one) to the multi-contact
Many2many.

The field x_fc_default_coc_contact_id (Many2one column on res_partner) was
renamed to x_fc_default_coc_contact_ids (self-referential Many2many, rel
table fp_default_coc_contact_rel). Odoo creates the new rel table during the
schema-update phase but leaves the old column orphaned. Copy each partner's
single contact into the new M2m so existing per-customer CoC routing carries
over, then drop the dead column. Idempotent + guarded on column existence.
"""
import logging

_logger = logging.getLogger(__name__)


def migrate(cr, version):
    # Old column still present (Odoo doesn't drop removed-field columns)?
    cr.execute("""
        SELECT 1 FROM information_schema.columns
         WHERE table_name = 'res_partner'
           AND column_name = 'x_fc_default_coc_contact_id'
    """)
    if not cr.fetchone():
        return
    # New M2m rel table created by the schema update before this runs.
    cr.execute("""
        SELECT 1 FROM information_schema.tables
         WHERE table_name = 'fp_default_coc_contact_rel'
    """)
    if not cr.fetchone():
        _logger.warning(
            'fp_default_coc_contact_rel missing — skipping CoC contact '
            'migration (rel table not created yet).')
        return
    # Copy the single value into the M2m (skip rows already present so a
    # re-run is harmless).
    cr.execute("""
        INSERT INTO fp_default_coc_contact_rel (partner_id, contact_id)
        SELECT p.id, p.x_fc_default_coc_contact_id
          FROM res_partner p
         WHERE p.x_fc_default_coc_contact_id IS NOT NULL
           AND NOT EXISTS (
               SELECT 1 FROM fp_default_coc_contact_rel r
                WHERE r.partner_id = p.id
                  AND r.contact_id = p.x_fc_default_coc_contact_id)
    """)
    moved = cr.rowcount
    cr.execute(
        "ALTER TABLE res_partner DROP COLUMN IF EXISTS "
        "x_fc_default_coc_contact_id")
    _logger.info(
        'CoC contact migration: copied %s single Default-CoC-Contact value(s) '
        'into the new x_fc_default_coc_contact_ids M2m, dropped old column.',
        moved)